20971650 has 48 divisors (see below), whose sum is σ = 59442624. Its totient is φ = 4793280.

The previous prime is 20971627. The next prime is 20971651. The reversal of 20971650 is 5617902.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20971651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8937 + ... + 11036.

It is an arithmetic number, because the mean of its divisors is an integer number (1238388).

Almost surely, 2^20971650 is an apocalyptic number.

20971650 is an abundant number, since it is smaller than the sum of its proper divisors (38470974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20971650 is a wasteful number, since it uses less digits than its factorization.

20971650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19995 (or 19990 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 20971650 is about 4579.4814116884. The cubic root of 20971650 is about 275.7682101400.

The spelling of 20971650 in words is "twenty million, nine hundred seventy-one thousand, six hundred fifty".